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TDA4854 Datasheet(PDF) 7 Page - NXP Semiconductors

Part No. TDA4854
Description  I2C-bus autosync deflection controllers for PC/TV monitors
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 7 page
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1999 Jul 13
7
Philips Semiconductors
Product specification
I2C-bus autosync deflection controllers for
PC/TV monitors
TDA4853; TDA4854
Fig.3 Pin configuration for TDA4853.
handbook, halfpage
TDA4853
MGM066
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32
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28
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HFLB
XRAY
BOP
BSENS
BIN
BDRV
PGND
HDRV
XSEL
VCC
EWDRV
VOUT2
VOUT1
VSYNC
i.c.
HSMOD
HPLL2
HCAP
HBUF
HPLL1
HREF
SGND
VCAP
VREF
VAGC
VSMOD
ASCOR
SDA
HSYNC
CLBL
SCL
HUNLOCK
Fig.4 Pin configuration for TDA4854.
handbook, halfpage
TDA4854
MGM067
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32
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30
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HFLB
XRAY
BOP
BSENS
BIN
BDRV
PGND
HDRV
XSEL
VCC
EWDRV
VOUT2
VOUT1
VSYNC
FOCUS
HSMOD
HPLL2
HCAP
HBUF
HPLL1
HREF
SGND
VCAP
VREF
VAGC
VSMOD
ASCOR
SDA
HSYNC
CLBL
SCL
HUNLOCK
FUNCTIONAL DESCRIPTION
Horizontal sync separator and polarity correction
HSYNC (pin 15) is the input for horizontal synchronization
signals, which can be DC-coupled TTL signals (horizontal
or composite sync) and AC-coupled negative-going video
sync signals. Video syncs are clamped to 1.28 V and
sliced at 1.4 V. This results in a fixed absolute slicing level
of 120 mV related to top sync.
For DC-coupled TTL signals the input clamping current is
limited. The slicing level for TTL signals is 1.4 V.
The separated sync signal (either video or TTL) is
integrated on an internal capacitor to detect and normalize
the sync polarity.
Normalized horizontal sync pulses are used as input
signals for the vertical sync integrator, the PLL1 phase
detector and the frequency-locked loop.
The presence of equalization pulses is allowed for correct
function of the PLL1 phase detector only in TV mode.
Vertical sync integrator
Normalized composite sync signals from HSYNC are
integrated on an internal capacitor in order to extract
vertical sync pulses. The integration time is dependent on
the horizontal oscillator reference current at HREF
(pin 28). The integrator output directly triggers the vertical
oscillator.
Vertical sync slicer and polarity correction
Vertical sync signals (TTL) applied to VSYNC (pin 14) are
sliced at 1.4 V. The output signal of the sync slicer is
integrated on an internal capacitor to detect and normalize
the sync polarity. The output signals of vertical sync
integrator and sync normalizer are disjuncted before they
are fed to the vertical oscillator.




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